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Ensure appservices can auth as users in their namespaces

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Currently in Dendrite appservices can only auth as a user if the user was created by said appservice. This does not align with the appservices spec which specifically says:

> The application service may specify the virtual user to act as through use of a user_id query string parameter on the request. The user specified in the query string must be covered by one of the application service’s user namespaces.

https://matrix.org/docs/spec/application_service/r0.1.2#identity-assertion

In the case that a user has been created for example via manual registration but belongs to an appservice namespace, the current functionality does not allow appservices to auth as them. This PR fixes that by replacing the appservice ID check with a check against the appservice namespace.

This also matches Synapse functionality, which I confirmed to allow appservices to auth as a user in their namespace, irregardless of how the user was registered.
This commit is contained in:
Jason Robinson 2020-12-25 22:46:29 +02:00
parent a85051ca9d
commit bca2790c67
1 changed files with 3 additions and 3 deletions
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6
userapi/internal/api.go
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@ -389,9 +389,9 @@ func (a *UserInternalAPI) queryAppServiceToken(ctx context.Context, token, appSe
if localpart != "" { // AS is masquerading as another user
// Verify that the user is registered
account, err := a.AccountDB.GetAccountByLocalpart(ctx, localpart)
// Verify that account exists & appServiceID matches
if err == nil && account.AppServiceID == appService.ID {
_, err := a.AccountDB.GetAccountByLocalpart(ctx, localpart)
// Verify that the account belongs to the appservice user namespaces
if err == nil && appService.IsInterestedInUserID(appServiceUserID) {
// Set the userID of dummy device
dev.UserID = appServiceUserID
return &dev, nil